I just picked up a Rev 4 BeagleBone Black from Micro Center for ~$40 with the intent of using it as a wiki server for both my own personal notes and those for my home and family. While the BeagleBone comes with an embedded 4GB chip pre-installed with Debian, I need more space to store my notes, so I also picked up a 16GB micro SD card.

Since the BeagleBone Black (BBB) is more powerful than the Raspberry Pi, I suppose you could use pretty much any wiki software that runs on the ARM architecture with reasonable performance. But, I wrote software specifically for this purpose: a Git-backed Markdown-based wiki in a single executable - Goiki. This is what I’ll be running.